Is the Trickling Filter Process Better?
The basic difference between the wastewater-activated sludge process and the action involved in a wastewater-trickling filter should be understood. In the case of a trickling filter process, the bacterial film coating the contact material is stationary and likely to become clogged after some time. In the wastewater-activated sludge process, the finer suspended matter of sewage itself contains the bacterial film, which is kept moving because of the constant agitation. The so called sludge floc contains active, free-loving organisms which are being continuously swept through the sewage and which, in their search for food and work, oxidize the organic matter present in the sewage in a much more efficient way. As a result, the efficiency of wastewater-activated sludge plants is higher than that of wastewater-trickling filters. Other advantages are: (1) Lesser land area is required. (2) The operating head is also comparatively less. As such, little or no pumping is needed. (3) Higher degree
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